serrations

/S ER0 EY1 SH AH0 N Z/
noun
  1. 1

    The state of being serrated.

  2. 2

    A set of teeth or notches.

  3. 3

    One of the teeth in a serrated or serrate edge.

Source: https://en.wiktionary.org/wiki/serration, https://en.wiktionary.org/wiki/serrations